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tal

I'm a new condo apt owner in NY and in the process of what started as a minor renovation..while doing so, I realized I got no insulation on either sides of my apt facing my two neighbors -- aside from two 1/2' sheetrock (one in each apt) and some studs, I got nothing between me and the guys next door.

Those wall (from each side of the apt) are 45ft long and 17ft high (there are two floors) - i.e. about 760 sq/ft of wall from each side.

assuming I'd rather avoid the option of peeling out the sheetrock, insulating and re-building it, those are the option I came across:

1) drilling some holes along the wall (between each pair of studs, once every 3' high) and spray some acoustic foam in there.my problem is that I'm not sure there are no "open areas" on those walls (for ex. for plumbing under the sink etc) which will cause some issues with the foam.

2) applying another layer of sheetrock over the existing one.I've read recommendation for using 5/8" one, but other places said to use the "quite rock" which seemed amazingly overpriced. does that really worth it?

if applying another layer, should I use an MLV in the middle between those two layers?

should I use the green glue? is that really beneficial?

what should be the best solution and in what combination?

any other option you would recommend?

my main incentive for this project is to eliminate the angry face I'll be getting from my neighbors due to my somewhat loud music.I care less about me hearing them, but really would like to listen to music without the need to think twice or lower the volume.

I really can't wait to play my first tune and knowing my newly neighbors know nothing about it .

tal

What will be the downside of leaving the sheetrock as is (avoiding taking the wall down) and applying the MLV on it and then another layer of 5/8'' sheetrock?Clearly gutting it and making it nice and clean would be better but I'm trying to get the best while eliminating the unneeded work (and possible side effects).

if so, how would you suggest to apply the MLV to the existing sheetrock and how should I connect the extra layer of 5/8" sheetrock?would you say the Green Glue will be worth the price here?

if you don't insulate the cavity and decouple from the structure than all your doing is applying mass law with a potential resonance chamber and you might get a -5db at best and that would be it... and the neighbors will most likely hear only the bass and be more annoyed.

if you want to reduce bass you have to decouple the drywall from the studs.